Mechanical burglar alarm



April 9, 1940. H. EPsTElNA MECHANICAL BURGLAR ALARM Filed April 28, 1958 Harig Patented Apr. 9 1940 "UNITED STATES MEcHANioAL BURGLAR ALARM, Harry Epstein, Johnstown, Pa. y l Application April 28, 1938, Serial No. 204,875

s claims. (o1. 116-87) v It is the purport of the present invention toy provide a simple and inexpensive burglar alarm which may be vended Within'the price range of theaverage householder andis especially adapted for use on doors and Windows of houses or other buildings.

Principal objects of the invention are to provide a small inexpensive alarm devicev capable of facile attachment to windows, doors and the like; to provide a purely mechanical alarm automatic in its operation when a window or' door, with which it is attached, isopened; and to provide an audible signal wholly mounted on the inside of the door or window and capable of rapid engagement and disengagement and positively operable without possibility of injury or damage to person or property.

Other objects ofthe invention Will be apparent from the following description of the present preferred form'of the invention, wherein:

Fig. 1 is a front elevational view of an alarm constructed in accordance with the present invention, illustrating the application of the same on a window and window frame,

Fig. 2 'is a front elevational view of the alarm casing, portions thereof being broken away to disclose details, l

,Fig 3 is a longitudinal sectional view of the alarm casing taken centrally through ther latter and illustrating the application of the alarm,

Fig. ir is a transverse sectional view taken through the casing on line` 4-4 of Fig. 2 looking in the direction of the arrows,

Fig. 5 is a logitudinal `sectional view of the casing showing the position of the parts after the alarm has been sprung or operated, I

Fig. 6 is a rear elevational view of the alarm casing, and

Fig. 7 is a perspective view of the alarm release.

To illustrate the application oi" my invention, I have,in Fig. 1, illustrated a portion of a window casing 8 and window 9. The alarm of my invention is, as illustrated inFig. 1, attached. to the sash of the Window and operatively connected with the sill of the window frame.

Preferably, the alarm consists of a casing I0 formed of metal or other suitable material, the casing being preferably ofrectangular shape and relatively flat so as to occupy a minimum amount of spacewhen inuse. The casing may be stamped from a sheet and providedA with bayonetslots II through which latter nails I2 or other supporting means may be engaged.`

The casing is equipped with suitable detonating mechanism which may consist of a spring pressed hammer I3 hingedly '-mounted, as in# dicated at I4, midway the endsof the casing.

The hammer complements and is adapted for engagement with a detonating cap holder I5. The manner of mounting the vcap in the holder is illustrated to vadvantage ingFigs. 3 and 5, wherein the cap is illustrated'at I6. Preferably, the cap.

container' I5 isy mounted inthe casing adjacent `one end of the latter, the opposite end ofthe casing being adapted to receive the hammer wheny the latter is in a cockedor setposition, as shown in Fig. 2 of the drawing.` The container .I5 mayv be iixed from displacement by forming tabs I 1 on opposite sides of the container, the tabs extending through openings I8 formed in the bottom wall of the container, as'illustrated to advantage in Fig. 4.

The container isalso provided with a cover or lid I9, one end of which is preferably pivotally mounted, as indicated at 20, in one end of the container, this being the end opposite to that in which the cap holding container I5 is mounted.

The cover or lid I9 is designed and utilized for the purpose of holding the hammer in a cocked or` set postion, as the coverextends over the de-l n tonating mechanism mounted `in the casing. vThe lid I9 may be held from casual movement by` suitable means, generally designated 2|, co-nsisting of a bar one endof which is slidably mounted in a loop 22, the latter being formed in the bottom wall of the casing l0, as shown to advantage in Fig. 6. The opposite/end of said bar is formed to provide a yoke 23 which slides over the free end of the lid I9.

To set the alarm, the hammer I3 is operated into a cocked or set position and the lid I9` closed into vengagement theiewith,pursuant to which the yoke 23 is slid into a positionv overhanging the free end of the lid.` .The alarm is from the lid or closure I9, any suitable means` may be employed. Inthe drawing, I have shown a cable 24, -one end of which is secured to the means 2|, which has been referred to above asthe releasing bar,` the opposite end of the cable 2.2!; I being anchored to a hook 25 or the like which is engaged with the sill of the Window frame 8.

In operation, it is manifest that when the window is moved into an open position, the releasing bar is caused tobe disengaged from the lid I9 permitting the detonating mechanism. to operate in a manner already described. It is, of course, to be understood that although I have described the invention as being particularly adapted for use on windows, nevertheless it is susceptible of a variety of uses. Furthermore it is to be understood that various changes may be made especially in the details of construction, proportion and arrangement of parts Within the scope of the claims hereto appended. What is claimed is: I l. An alarm device including a casing, detonating mechanism mounted in said casingincluding a spring-pressed releasable hammer and a cap carrying container in the path of said ham'- tainer.

2,196,961 :"agj Q: um. v

2. A burglar alarm for attachment'to the closure of a house, comprising a casing engageable with the house closure, a part of the casing being movable, detonating mechanism mounted vin the casing, a part of the detonatingmechanism being movable and adapted to oo-act with the rmovable part of the casing, and means movably car` ried by the casing and engageable with the movable part of the latter to secure the `movable part of the detonating mechanisml from operation, said means being anchored to a fixed part of the house, adjacent the closure, whereby opening of the closure actuates the said means to l eiect release of the movable casing part and 1 detonating parts.

3. In combination with a closure frame and a closure movably mounted in the latter, a casing contained detonator carried by the closure, a` part of the casing forming a lid and being movable and arranged to hold ythe detonator inop- 20 erative, and release means. mountedy on. said` casing andengageable withsaid lid, the release f means being operable upon movement of the closure, to eiect disengagement of said release means from said lid, whereby the lidv moves free of the detonator to permit operation of thedetonator. f Y

,l ,HARRY EPsTEiN. 

